This was Sabrina, the former child prodigy! And quite possibly the Blood Blade user in the tournament. She didn't like the odds, Wallice absolutely needed her students to be on their best possible techniques to stand a chance against this girl. A one-on-one would have been a real disaster.
A strong cord of unity bound not just Gabby and his team mates, but also their lead teacher. So when they heard the urgency in Wallice's tone, they all read the hidden meaning in her cryptic message. Of course it merely reiterated what they already knew- this was no ordinary girl. She was as dangerous as a serpent, only she had perfected the art of keeping it hidden behind a wall of polite smiles.